Suction-base circle marking and cutting instrument.



I P. CRUTCHFIELD.

sucTIoN BASE CIRCLE MARKING AND CUTTING INSTRUMENT.

APPLICATION FILED MAR. 4. 1914.

1,166,889. Patented Jan. 4, 1916.

@EINEN 'IIAII i ATTRNEY CQLUMBIA PLANDGRAPH C.. WASHINGTQN. n. C.

uw s

PAUL cia-Utronrrnru),l or PORTLND, OREGON] Specification of Letters Patent. :i Pateliltedjdtll 4, 1916'. gV

Animation med Marh 4, i914. serial N. 822,534.

To all 'whom/t may concern:

Be it known that I, PAULCRUTCHFIELD, a

citizen of the United States, and a resident of thev city of Portland, county of Multnomah, State of Oregon, have inventeda new and useful Improvement in Suction- Base Circle Markingf and Cutting Instruments, of which vthe following is a specification.

VVMy invention relates to devices for cutting a circular portion out of a fiat piece ofv material, such as glass for example, or for merely marking a circle on the surface of the material. In either case the standard pivotally supporting the cutting or marking instrument must be supported in place; and to provide a device adapted for being readily Vsecured in place onthe surface byl a mere suction hold of the base ofthe standard of my device is one ofthe main objects of my invention. l v

It is also my object to so construct my device that` it may be conveniently used for cutting and marking circles of 4diameters varying from 2 to 48 inches.V l y To this end my invention consists of a standard provided with aV suction base, 'a post journaled in such standard, a graduated beam, with a slide bar, pivoted on the post, and providing one end of the slide bar with means for holdingv a marking or cuta ting instrument.

The other details of construction, and the operation of my device are hereinafter fully described.

In the accompanying drawings: Figure 1 is a side elevation of my device'as arranged forbeing used for cutting or marking cir' cles having a diameter of from 2 to 12 inches inclusive; Fig. 2 is a topview `of my device as shown in Fig. l; Vthe dottedportion shown in the left-hand end of Figs. 1 and 2 representing an auxiliary extension bar which isused only .when circles of larger diameter are to be produced; Fig. Slis atop view of a ysubstitute slide bar which is ,usedl when it is desired to cutor mark very large circles; Fig. L is a transverse section of the pivot post and its suction base, the -section being taken on line 4-4 of Fig. l; Figs. 5 and Gare a longitudinal section showing the means for fastening the auxiliary extension bar to the slide bar; and Fig. 8 is a section on line 8 8 of Fig. 1.

a represents a sheet of glass outof which details of a stud screw; Fig.V 7 isA a circular portionis tov be( i The standard of my device ycomprisesa hemispherical rubber Yshellno-rv 'suction base, which 'isil affixed to the sheethof glass byV causing a. partial vacuum in thejsuction-bas'e. On` the' Vlatter is mounted a metallic standard 7j l y made with a'concave bottom surface. The

`post o is vjournaledbin the memberl o" and is made with a circular-,flange c". Ball-bearing elements d, are interposed between ly the vtop surface of the standard b and the lower surface of the {iange cof lthe Apost',`f,, to'V facilitate the, rotaryV motionl'of the` latter. vThevflongitudinal displacement of ,the`post, 0is prevented by thev washer o2 and screw o3, threaded into Vthe* bottom ofthe post.

The upper end o2 of the post c is threaded and has a nutat. The upper end of thisjnut 1s madel with a` cavity and. 'a' partially coredoutcap n fits in said cavity. The cap 'a' is,A

proyided with a peripheral groove n?. Pins, n3, lnserted through the top of the nut n, as shownV in Fig. 4,. bear in said 'peripheral groove andvthus permitthe mit` fitto be r0.-V y 4tated"independently lof'the cap n". vrllhe,

cored-outcap n serves as an inclosure forA the upper end 0 2 of thev post @Xandas a hold Vforone hand while the other, hand is' rotating the nut, fn, in Ithei'acl' lof clamping' orL releasing the slidebar' y c The .graduated beam, e, has a longitudinal sloteand its forward end e2 is turned upward and slotted Yso las tol form'a guidebearing for a' slide-bar f."

The slide-bar 7` 's made t'vit'hl a'longitudif nal slot f and its left end (having wreference to the positions of theparts kin the draw-v ings) is provided with a' 'recessed portion.)c2

madewith a-centrally located lsquare' hole f3, a

which constitutes a seat for the pointer g.

The latter lis secured in place bya screw, h,-

having its head-,h/'made withgafshoulder 1h? and rinserted upwardly througli'the slotlejof thebeam e, the hole f3 ofthe slide bar f, and

a hole in the pointer "g; and onthe extremity ofthe screw his threadeda nut h2; The.y

shoulder' h3 -of I tlie'screw head L prevents the screw 71, from'turning. By loosening the nut h2 the bar f maykk be ,h longitudinally moved until the pointer g comes `intoQ'alinement with any predetermined graduation of the beam e. The right ena of meende-bar fis made with a holder f4 for the marking o'r cutting instrument, m, which is clamped by the set-screw m2. The instrument:llu's.`

tratedisga glass cutter, as vshowny by m. l

lio

My device, as thus far described, is adapted for cutting circles having a diameter varying from 2 to l2 inches. For cutting circles having a diameter varying from l2 to 22 inches, l provide a substitute slide bar r, shown in Fig. 3, and which is to be used in place of the slide bar f. As will be noted by comparing Figs. 2 and 3, the substitute slide bar r is like the bar f, except that it is longer'. The slot f5 of the slide bar r has the same length as the slot f of the bar `When said substitution is to be made the nuts ft2 and n are removed and replaced after the substitution has been made. `When the bar r is used ten inches will be addedto the lower and upper scales shown on the beam c; thus when the pointer g is placed to register3 inches on the lower scale of the beam c, the instrument would mark or cut a circle of 3 inchesplus l() inches, equaling 13 inches.

n order to adapt my device for describing circles having a diameter varying from 3ft inches to i8 inches, provide an extension bar 0, which is fastened to the left end c7 or' the beam e. The bar 0 is made with a plurality of holes 0 spaced one inch apart. The bar 0 is necessarily made detachable so that it may be removed and not render my device unhandy when to be used for describing circles of smaller diameter. The left end e7 of the beam e is made with a. sunken surface and is provided with two stud pins e3, and a stud screw et, on which screws a nut c5; and the related end of the bar 0 is also made with a sunken surface and holes to receive the stud pins c and screw c4. See Fig. 7.

My device, as shown in the drawings, is adapted to cut circles whose diameter varies from 2 to 48 inches. The measurements used represent those merely suggesting themselves as convenient, and as evident other measurements may be employed, and the sizes of the parts of my device relatively changed to adapt the same for describing circles of other diameters.

In operation my device is used as follows: To describe a circle having a diameter of 3 inches the standard c is arranged under the right end of lthe slot e of the beam e (as shown in Figs. l and 2) and the slide-bar 7 is adjusted to bring the pointer g to read `3 on the lower scale of the beam. See Fig. 2. The nuts h2 and n are then tightened and the instrument m is revolved about on the post c. And to describe any other circle of v thus when the pointer g indicates 2 inches on the lower scale or" the beam e, the circle described will be l2 inches in diameter, and when the pointer g indicates l2 inches on the lower scale the diameter of the circle will be 22 inches.

To describe a circle having a diameter varying from le to 24 inches inclusive, the nut n must be removed from the top c2 of the post c and said post inserted through the hole e6 of the beam e, and the upper scale of the beam e read in connection with the adjustment of the slide bar To describe circles varying in diameter from 24 to 34 inches inclusive,'the substitute slide-bar r is used in place of the slide bar f, and the adjustment of the substitute slide bar is made with respect to the upper scale of the beam e, to which 10 must be added, as above mentioned. The top of the post c is inserted through the hole c6 of the beam e, the substitute slide bar r used in place o1" the slide bar f, and the adjustment of the pointer g is made on the upper scale of the beam c,

l0 being added to the measurement indicated, as above described. ln describing circles of a diameter varying from 24 to 33 inches the extension bar o must be aiiixed to the left end of the beam c. The bar 0, as mentioned, has a plurality of holes 0 one inch apart, and the post c must be inserted through one or the other of these holes in order to attain the measurement desired. For example, to describe a circle ot' 2G inches in diameter the post c is inserted in the hole 0 marked 26 and the slide bar is moved until the pointer g registers with the graduation 24. To describe a circle 25 inches in diameter the slide bar f is moved until the pointer g registers with the graduation 23, thus 2 inches must be added to each reading of the upper scale of the beam e. To describe circles varying in diameter from 24 to 48 inches inclusive, the bar o must be used, and the substitute slide bar 7" must replace the bar f. For example: to describe a circle of 4:3 inches in diameter the post c would be inserted in the hole 0 marked 38 gmx of the bar o (see Fig. 2) and the substitute y slide bar r moved outward its full length. l

To adjust my device, when arranged as last mentioned, so as to describe a` circle of smaller diameter, for example say L7 inches, the substitute slide bar r would be moved inward one inch on the scale of the beam e.

I claim:

l. In a device of the character described, a pivot element comprising a suction base, a standard thereon mounted, a .post journaled in the standard, a nut threaded on the upper end of the post, and a piece providing a hand-hold rotatably secured on the nut.

2. In a device of the character described, a pivot element comprising a suction base, a standard thereon mounted, a post journaled 'ineesa jvinthestandard, saidpost rnadei'vvvvith a pei ripheral Hang@ballfbearingsbetvveen such flange andjthetopoffthe standarda nut threaded onv the upper end of the post, and a piece providing-a hand-hold rotatably secured onthe'nut.V74 v 3.n Inga device of the character described," a pivot element lc'fzoinprising helnijspheric-l .cup-'like resilient baser lastandardthereon'` mounted7 a post Journaledin the standard, a nut threaded onthe upper end of the post,

and a piece providing Va hand-hold rotatably secured on the nut.

4. In a device of the character described, a

' pivot elementl comprising a hemispheric cup,- like resilient base, a standard thereon mount'- r ed, a post ournaled inv the standard, said post Inade Withwa. peripheralk flange, ballbearings betWeen'sueh-i'lange and the top of thestandard, and a cap providing a handr` hold rotatably secured on the nut and inclos. ing the upper'end ofthe'post. A .e

5.*In a device of the charaoterdescribed, thecornbination of a standard, a beam add -just'ably supported by the standard, a slide bar longitudinallyY adjustable on the beam,

said bar provided on oneend v vith a cutting Copies of'this patent maybe obtained for o'rlmarlringinstrument', and rneans for lock#` ,l Y

"ing" the bar and beanillin anyfpositionto 30,1V 6. 'In ade'vice of thecharacter"described, jf: '.7

-ivhi'eh they :have y'been adjusted. I

,Y the'combinationuof l'a' standard', Aprovided, i

ported by' the .standard and vlongitudinally adjustable with: respect to theflatter, a slide Ybar longitudinally adjustabl'epon the beann' with a suction` basesg, graduated beamy Sup; j d

*said bar provided on one end with a marking instrument andvmeans for locking/the ,bar4 and beani in any position to which they have barlongitudinally 'adjustable vonthe beain,

said bar `provided onone end .with a-nlarl-v .ing instrument and afclarnpingr Adevice for i locking the barv and beani in any position toi which they have been adiusted.

PAUL CRUTCHFIELD. l, j, 

